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Sounds like you don't need the query to make them comma-separated, so that's something better done in the view. Along these lines (untested):
$query = $this->Employees->find()
->contain(['Attendance' => [
'queryBuilder' => function (Query $q) {
return $q->where(['Attendance.status' => 'Absent']);
}
]]);
This will get the list of employees with all their absent attendance records. (If you need to get only employees that were absent at least once, you can use->matching(...) to do this.
Then in your view:
foreach ($query as $employee) {
// Output $employee->id, name, email, you know how to do that
echo implode(',', collection($employee->attendance)->extract('Date')->toArray());
}
If you can use plain sql query, you do it like this, join employees table with attendance table and usegroup_concat withif function to get absence dates into a list :
SELECT emp.ID,
emp.Name,
emp.email,
GROUP_CONCAT(IF(att.Status = 'Absent', att.Date, NULL) SEPARATOR ',') AS `Absent Date`
FROM Employee emp
JOIN Attendance att
ON emp.ID = att.`Employee ID`
GROUP BY emp.ID, emp.Name, emp.email
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